M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Chemistry
ANALYTICAL CHEMISTRY I
Time: 2½ Hours
Max. Marks: 70
Instructions: Answer to all questions should be written in one answer book. All questions carry equal marks. Figures to the right indicate full marks. Use of log table and calculators is allowed.
Q.1
Multiple choice questions.
14
The electrode at which the analyte is oxidized or reduced is known as:
Reference electrode
Counter electrode
Working electrode
None of these
The exact sum of 135.621, 97.33, and 21.2163 is appropriately reported in analytical chemistry results as:
254.1673
254.167
254.17
254.2
The liquid-solid chromatographic separation is based on:
Difference in volatility of compounds
Difference in solubility in two immiscible liquids
Difference in rate of movement of a solute through a stationary phase
None of these
The Microsoft excel is used in the chemistry for:
Plotting graphs
Performing calculations
Sorting data
All of these
In the polarographic technique:
Electrode poisoning is the problem
Steady increase in the current is observed
Electrode surface area remains constant
None of these
Which of the following is not the system error:
Instrumental error
Indeterminate error
Method error
Personal error
Calculate the percent relative error due to the 0.4 mg loss of Zn in the course of its analysis, if the mass of Zn in the sample is 30 mg.
101.33%
98.67%
1.33%
-2.66%

If the selectivity factor for eluent A and B is equal to then:
The solutes elute with identical retention times
Solutes are not retained on stationary phase
The solute A elute faster than B
Both the solutes has equal concentration in the sample.

If four water samples taken from the same water supply and analyzed in the laboratory for calcium, then:
They are four analytical samples
They are a single analytical sample
They are four statistical samples
a b
10) In the linear regression the intercept, of line going through the origin will be:
0.00
-1.00
+2.00
1/m
11) When current proportional to analyte concentration is monitored at a fixed potential, the technique is called:
Volametry
Potentiometry
Polarography
Amperometry
12) The gives:
Retention time
Selectivity factor
Theoretical plates
Resolution
13) The array is used:
To store multiple values of same type
To store values of different type
To perform several operations
All of these
14) Which of these is the classification of the analyses by sample size:
Ultratrace
Micro
Trace
Major
Q.2
a)Answer the following (any four)
08
Define accuracy and precession
What is column efficiency?
With the help of appropriate example explain what homogeneous sample is.
Brief on confidence interval
Explain supporting electrolyte in brief
b)Write notes on (Any two)
06
Explain working of thermal conductivity detector. Draw suitable schematic diagram
Write the Ilkovic equation and explaining each term in it.
Explain how internet is useful in education.
Q.3
a)Answer the following(Any two)
08
Write a note on the random error and its distribution.
Explain in brief different chromatographic methods.
What is arrays and variable in programming? explain
b)Write notes (Any one)
06
Write a detailed note on the stationary phases used in gas- liquid chromatography and discuss applications of each
Explain in detail different amperometric titration curves.
Q.4

Answer the following (Any two)
10
Explain plate height and number of theoretical plates. How they influence column efficiency?
With the help of schematic diagram explain the instrumentation of amperometer and discuss its applications.
Discuss the procedure for the detection of the systematic method error.
b)Answer the following (Any one)
04
Write a note on the continuous flow sampling
Discuss the applications of PCMODEL
Q.5
Answer the following (Any Two)
14
a)Explain their working principle of various detectors used in the liquid chromatography?
b)What are the different conditional statements and loops used in basic programming? Explain the loops.
c)Discuss the sources of residual current in the linear scan polarography.